목록 Coupling apparatus and image forming apparatus employing the same Name W. Chung, J. Yang, E. Park, S. Lee Year 2007 U.S. Patent No. 11/947,313, Nov. 2007. Europe Patent No. 07122167.5, Dec. 2007. China Patent No. 200710306671.0, Dec. 2007. Korea Patent No. P2007-0096135, Sep. 2007.